“You have to assume that if [undocumented immigrants] get sick they are going to get medical care or die,” said Dr. Michelle Barron in the infectious disease department of the University of Colorado School of Medicine. “There is a long list of diseases that hospitals must report to the health department. Tuberculosis. Measles. Let’s say you came to the emergency room after traveling in Russia, and you have measles. That’s considered 24-hour-reportable. You would then be contacted by the health department and asked questions about vaccinations and where you’ve been. They would identify how big of a scope this would be.”

“Public health departments actually report these things,” Barron continued. “There’s public reporting. The information wouldn’t be hidden in the background because of a political agenda. It’s part of the reporting that has to happen. If there is a trend, that would be investigated.”

And, she added, if a serious disease outbreak occurred, it would be “all over the news,” not left to the investigators on talk radio only.

But what happens if we can’t find the immigrants, I asked.

“The public health department has lots of experience hunting people down,” she said. “They will go to your door. There are always the few people who won’t talk or answer the door, but they have their networks of people who will talk, even in homeless communities. Homeless people don’t want to get disease either. They will talk. The public health department is more savvy than people realize.”

How to convince skeptics like Clark and Marble?

“Really and truly, you have to trust that the health care workers are doing the right thing,” said Barron. “If you have already decided what you feel about this, no matter what evidence you are presented with, you are not going to believe it.”

For more information, including a transcript of the Marble interview, click here.